JP2003152601A - Frequency hopping radio communication apparatus and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve communication efficiency by skipping receiving processing of a hopping frequency in which a receiving defect state occurs, in radio communication due to a frequency hopping system. SOLUTION: A frequency information managing table is provided for storing a receiving state flag, the number of times of receiving defects, the number of times of skips, the number of times of satisfactory monitoring reception and the number of times of defective monitoring reception or the like corresponding to a hopping channel and when a number C1 of times of receiving defects exceeds an abnormal threshold N1 in an ordinary state and a receiving defective state is detected, a receiving skip state is provided for skipping receive processing until a number C2 of times of skips exceeds a set value N2. When such a receiving skip state is ended, a monitor state is provided for monitoring a communication state while performing receive processing and when a number C3 of times of satisfactory receiving exceeds a satisfactory threshold N3 in such a monitoring state and a satisfactory receiving state is detected, the ordinary state is recovered. When a number C4 of times of defective receiving exceeds an abnormal threshold N4 and a defective receiving state is detected, the receiving skip state is recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency hopping radio communication apparatus and a radio communication method for communicating communication data by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern.

[0002]

2. Description of the Related Art As a conventional frequency hopping radio communication apparatus, for example, the one described in Japanese Patent Application Laid-Open No. 11-177531 is known. In this conventional example, when an interfering radio wave for the CSMA / CA low-frequency hopping spread spectrum communication is detected in any one wireless zone, the hopping pattern used by the wireless master station and the wireless slave station in the wireless zone is disturbed. The hopping pattern is changed to the first hopping pattern for communication failure countermeasures using only the frequency in the frequency band that can avoid radio waves, and is used by the wireless master station and the wireless slave station in another wireless zone adjacent to the wireless zone. Is changed to a second hopping pattern for communication failure countermeasure using a frequency band other than the frequency band of the frequency used in the first hopping pattern for communication failure countermeasure, so that the frequency collision probability is reduced.

[0003]

However, in the above-mentioned conventional example, when a jamming radio wave is detected in one wireless zone among a plurality of wireless zones, the hopping pattern in the corresponding wireless zone is detected. The hopping pattern for countermeasures against communication is changed to a first hopping pattern for countermeasures against communication using only the frequency of the frequency band capable of avoiding the interference wave, and at the same time, the hopping pattern of the adjacent wireless zone is the second hopping pattern other than the hopping pattern for countermeasures against communication. Since it is changed to the communication failure countermeasure hopping pattern, when the jamming radio wave is detected even in the first communication obstacle countermeasure hopping pattern, communication cannot be performed and the communication method C
Since the SMA / CA method is adopted, when a channel search is performed at system startup or when a wireless slave station tries to transmit to a wireless master station, there is no other wireless slave station transmitting to the same zone. There is an unsolved problem that it is necessary to perform a training operation such as carrier sense to check whether or not the original communication standard needs to be changed, and mutual communication can be performed only by a wireless communication device corresponding to this.

Therefore, the present invention has been made by paying attention to the unsolved problem of the above conventional example, and receives the communication data by skipping the hopping frequency in which the communication state is deteriorated by the jamming radio wave. Accordingly, it is an object of the present invention to provide a frequency hopping wireless communication method and a wireless communication device capable of efficiently performing a reception process without changing a hopping pattern.

[0005]

In order to achieve the above object, a frequency hopping radio communication device according to claim 1 is provided.
In a frequency hopping wireless communication device adapted to communicate with communication data by a frequency hopping method in which frequency hopping is performed based on a predetermined hopping pattern, in a normal communication state or an abnormal communication state while receiving the communication data. Communication state determination means for determining whether there is, reception skip means for skipping a predetermined number of times the reception processing of the communication data at the corresponding hopping frequency when in an abnormal communication state, and communication while performing the reception processing of the communication data Monitoring means for monitoring the state, selecting the reception skip means when the determination result of the communication state determination means and the monitoring result of the monitoring means are in an abnormal communication state,
And a selecting means for selecting the monitoring means when the reception skipping means has finished skipping a predetermined number of times and selecting the communication state determining means when the monitoring result of the monitoring means is in a normal communication state. It is characterized by that.

A frequency hopping radio communication device according to claim 2 is a frequency hopping radio communication device, wherein communication data is communicated by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern. Communication state determination means for determining whether the communication state is normal or abnormal while performing data reception processing, and reception processing of the communication data at a hopping frequency corresponding to the abnormal communication state a predetermined number of times. Reception skipping means for skipping, monitoring means for monitoring the communication state while performing the reception processing of the communication data, and the reception when the determination result of the communication state determining means and the monitoring result of the monitoring means indicate an abnormal communication state If the skipping means is selected and the skipping operation is completed a predetermined number of times by the receiving skipping means. To select the monitoring means, select the communication state determination means when the monitoring result of the monitoring means is a normal communication state, and the transmission processing of the transmission data for the hopping frequency skipped by the reception skipping means. It is characterized by comprising a transmission skip means for skipping.

Further, the frequency hopping wireless communication device according to claim 3 is the same as the invention according to claim 1 or 2,
The communication status determination means and the monitoring means are configured to manage the communication status at each hopping frequency with a frequency information management table. Furthermore, the frequency hopping wireless communication device according to claim 4 is the frequency hopping wireless communication device according to any one of claims 1 to 3, wherein the communication state determining means and the monitoring means count an abnormal number of reception states, and the count value is abnormal. It is configured to judge that the communication state is abnormal when the threshold value is reached, and is characterized in that the abnormality threshold value of the monitoring means is set to a value smaller than the abnormality threshold value of the communication state determination means.

Still further, in the frequency hopping wireless communication device according to claim 5, in the invention according to any one of claims 1 to 4, the communication state determining means and the monitoring means determine the communication state based on the electric field strength of the received data. It is characterized in that it is configured to judge by. The frequency hopping wireless communication device according to claim 6 is the wireless communication device according to claim 1.
In any one of the inventions, the communication state determination means and the monitoring means are configured to determine the communication state based on a code error rate of received data.

Further, the frequency hopping wireless communication method according to claim 7 is the frequency hopping wireless communication method, wherein communication data is communicated by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern. A communication state determination step of determining whether the communication state is a normal communication state or an abnormal communication state while performing data reception processing, and a hopping frequency corresponding to the communication state determination step when the communication state determination step determines that the communication state is the abnormal communication state. A skip step of skipping the reception process of the communication data of a predetermined number of times, and monitoring the communication state while performing the reception process of the communication data for the hopping frequency for which the skip of the predetermined number of times is completed in the skip step,
And a monitoring step of shifting to the communication state determining step when in a normal communication state, and shifting to the skip step when in an abnormal communication state.

Furthermore, the frequency hopping radio communication method according to claim 8 is the frequency hopping radio communication method, wherein communication data is communicated by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern. A communication state determining step of determining whether the communication state is a normal communication state or an abnormal communication state while performing reception processing of communication data, and a hopping frequency applicable when the communication state determining step determines that the communication state is the abnormal communication state. In the skip step of skipping the reception process of the communication data in a predetermined number of times, the communication state is monitored while performing the reception process of the communication data for the hopping frequency for which the predetermined number of skips in the skip step are completed, and the normal communication state is obtained. Sometimes the process goes to the communication status judgment step, And a monitoring step proceeds to the skip step when a signal state is characterized by comprising a transmission skip step of skipping hopping frequencies in the skip state when transmitting communication data.

Still further, in the frequency hopping wireless communication method according to claim 9, in the invention according to claim 7 or 8, the communication state determining step and the monitoring step use the frequency information management table to indicate the communication state at each hopping frequency. It is characterized by managing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, WC is a short-range wireless communication device that performs wireless communication at a short distance of about 10 to several tens of meters. It is connected to the switching circuit 2, the reception side output terminal of the transmission / reception switching circuit 2 is connected to the reception circuit 3, and the transmission side input terminal is connected to the transmission circuit 4.

The receiving circuit 3 includes a bandpass filter 5 to which a received signal output from the transmission / reception switching circuit 2 is input, a low noise amplifier (LNA) 6 to which a filter output of the bandpass filter 5 is input, and the low noise. The mixer 7 for converting the output signal of the amplifier 6 into the intermediate frequency signal IF by the local oscillation signal L0 input from the frequency synthesizer 15 for frequency hopping described later, and the intermediate frequency signal IF output from the mixer 7 are input. The bandpass filter 8, the limiter amplifier 9 that amplifies the filter output of the bandpass filter 8, and the detection circuit 10 to which the amplified output of the limiter amplifier 9 is input are provided, and the demodulation output from the detection circuit 10 is performed. RSSI representing the strength of the received signal output from the signal and limiter amplifier 9
A (Receiver Signal Strength Indicator) signal is input to the baseband signal processing device 12.

On the other hand, the transmission circuit 4 has a bandpass filter 13 to which the transmission signal output from the frequency synthesizer 15 is input, and a power amplifier 14 to which the filter output of the bandpass filter 13 is input. The transmission signal output from the amplifier 14 is supplied to the transmission side input terminal of the transmission / reception switching circuit 2. Further, the frequency synthesizer 15 receives a phase-locked loop (PLL) circuit 16 to which a setting signal for setting frequency hopping output from the baseband signal processing device 12 is input, and an output signal of the phase-locked loop circuit 16 is input to the frequency synthesizer 15. A low-pass filter 17, a filter output of the low-pass filter, and transmission data from the baseband signal processing device 12 are input via a low-pass filter 18, and a local oscillation signal LO and frequency-hopping transmission to the mixer 6 of the receiving circuit 3 are transmitted. Voltage controlled oscillator (V
CO) 19 and the local oscillation signal LO output from the voltage controlled oscillator 19 is supplied to the mixer 6 of the reception circuit 3 and the transmission signal is supplied to the transmission circuit 4.

Further, the baseband signal processing device 12 is
A transmission data processing unit 21 for transmitting input user data, a reception data processing unit 22 for processing an analog reception signal input from the receiving circuit 3, and a 2.4 GHz band ISM for instructing the frequency synthesizer 15. (Ind
ustrial Scientific Medical) The frequency hopping control unit 23 that controls the frequency hopping of the band with a preset hopping pattern and the power supply from the built-in power source 24 such as a dry battery or a secondary battery, and the receiving circuit 3 transmits the power. The circuit 4 and the frequency synthesizer 15 are provided with a power supply controller 25 that controls the power supply.

Here, when the user data is input, the transmission data processing unit 21 forms the packet shown in FIG. 2 and outputs this packet to the voltage controlled oscillator (VCO) 19 of the frequency synthesizer 15. The packet has, for example, a 72-bit access code portion AC at the beginning, a 54-bit header HD indicating an address for each device, a payload portion type, retransmission control, flow control, etc. following the access code portion AC, and a predetermined number following the access HD portion AC. Data of 0 to 0
It is composed of a 2745-bit payload part PL. The access code section AC is composed of 4 bits of "0101" or "1010", a preamble section PA for facilitating DC offset correction, a 64-bit synchronization word section SW for establishing synchronization, and If necessary, it is composed of a preamble part PA following the sync word part SW and a 4-bit trailer part TR similar to the preamble part PA.

Further, the reception data processing unit 22 converts the analog demodulated signal input from the detection circuit 10 of the reception circuit 3 into a digital demodulated signal by, for example, A / D conversion, and if necessary, "01" of the preamble unit PA. The DC offset correction is performed with the pattern, and the synchronization word portion SW is correlated to establish synchronization and then the header portion HD and the payload portion PL are reproduced. Furthermore, the frequency hopping control unit 23
2402MHz to 2480M in the ISM band
Frequency hopping is sequentially instructed in a predetermined hopping pattern between Hz. The frequency hopping control unit 22 executes the receiving side hopping pattern management process shown in FIG. 3 and the transmitting side hopping pattern management process shown in FIG.

The receiving side hopping pattern management process is executed when starting the receiving process. As shown in FIG. 3, first, in step S1, the current hopping channel indicated by the pointer of the frequency information management table shown in FIG. The status flag F corresponding to the number is read. Here, as shown in FIG. 5, the frequency information management table uses, as an index, the hopping channel numbers of the hopping frequencies assigned in the order according to the preset hopping pattern.
Hopping frequency fi (i = 1, 2 ... n), monitoring in which the corresponding hopping channel is in a normal state in which normal reception processing is performed, is in a skip state in which reception processing is skipped, or monitors the state while performing reception processing. A status flag F indicating whether the status is a status, the number C1 of reception failures of received data,
The skip count C2 of the reception process, the good reception count C3 of the reception data in the monitoring state, and the reception failure count C4 of the reception data in the monitoring state are stored.

Then, the process proceeds to step S2, and the state flag F read in step S1 is "0" indicating a normal state.
It is determined whether the status flag F is "1" indicating a skip status or "2" indicating a monitoring status. In the normal status in which the status flag F is set to "0", the process proceeds to step S3. And outputs a command signal for activating the receiving circuit 3 and the frequency synthesizer 15 to the power supply control unit 25, and also outputs the hopping frequency fi of the corresponding hopping channel to the phased lock loop circuit 16 of the frequency synthesizer 15. Performs reception processing.

Next, in step S4, the RSSI representing the received signal strength output from the limiter amplifier 9 is displayed.
When the signal is read, the bit error rate BER is read from the reception data processing unit 22, and it is judged whether the level of the RSSI signal is equal to or higher than a predetermined level and the bit error BER is less than a set value. It is determined whether the state is a good state or a poor reception state, and when the good reception state is reached, the process proceeds to step S5, the number of poor reception times C1 is set to "0", and this is updated and stored in the frequency information management table. Then, the process proceeds to step S6, the pointer of the frequency information management table is incremented by "1", and then the process ends.

The determination result of step S4 is RSSI.
When the signal level is lower than the predetermined level or the bit error rate BER is the predetermined value or more in the poor reception state, the process proceeds to step S7, and the poor reception frequency C1 stored in the frequency information management table is read. A value obtained by adding "1" to the number of times of poor reception C1 is calculated as a new number of times of poor reception C1, and this is updated and stored in the frequency information management table. Then, the process proceeds to step S8, and it is determined whether or not the number of reception failures C1 exceeds a preset abnormal threshold value N1. If C1 ≦ N1, the process proceeds to step S6. If C1> N1, the process proceeds to step S6. S
9, the state flag F is set to "1" indicating the skip state, the number of skips C2 is set to "0", these are updated and stored in the frequency information management table, and then the process ends.

On the other hand, when the result of the determination in step S2 is that the state flag F is set to "1" indicating the skip state, the process shifts to step S10 to control the receiving circuit 3 and the frequency synthesizer 15 to the inactive state. To the power supply controller 25, and the output of the hopping frequency to the phased lock loop circuit 16 of the frequency synthesizer 15 is stopped, and then step S1 is performed.
Moving to 1, the skip count C2 is read from the frequency information management table, a value obtained by adding “1” to the skip count C2 is calculated as a new skip count C2, and the skip count C2 is updated in the frequency information management table. After storing, the process proceeds to step S12.

In step S12, the skip count C
It is determined whether or not 2 exceeds a preset set value N2, and if C2 ≦ N2, the process proceeds to step S6, and if C2> N2, the process proceeds to step S13 to monitor the state flag F. Is set to "2", and the number of good receptions C3 and the number of bad receptions C4 in the monitoring state are both set to "0", which are updated and stored in the frequency information management table, and then the process proceeds to step S6.

Further, if the result of the determination in step S2 is that the state flag F is set to "2" indicating the monitoring state, the process proceeds to step S14 and the step S3.
Similarly to the above, while outputting a command signal for operating the receiving circuit 3 and the frequency synthesizer 15 to the power supply control unit 25,
The hopping frequency fi of the corresponding hopping channel is output to the phased lock loop circuit 16 of the frequency synthesizer 15 to perform reception processing, and then the process proceeds to step S15.

In step S15, the RSSI signal output from the limiter amplifier 9 and the received data processing unit 2
The bit error rate BER output from 2 is read and RSS
The level of the I signal is a predetermined level or higher and the bit error rate B
By determining whether ER is below a predetermined value,
Determine whether the reception is good or poor,
When the reception state is good, the process proceeds to step S15, the monitoring state reception failure count C4 is set to "0", the monitoring state reception good count C3 is read from the frequency information management table, and the monitoring state reception good count C3 is set. "1"
Is added as a new monitoring state reception good count C3, the monitoring state reception good count C3 and the monitoring status reception failure count C4 are updated and stored in the frequency information management table, and then the process proceeds to step S17.

In this step S17, it is determined whether or not the number of times C3 of good reception of the monitoring state exceeds a preset set value N3, and if C3≤N3, the above-mentioned step S3 is directly executed.
6, and if C3> N3, step S18
In step S6, the state flag F is set to "0" indicating a normal state, the number of reception failures C1 is set to "0", these are updated and stored in the frequency information management table, and then the process proceeds to step S6. To do.

On the other hand, the judgment result of step S15 is RSS.
When the level of the I signal is lower than the predetermined level or the bit error rate BER exceeds the predetermined value and there is poor reception,
In step S19, the good reception count C3 is set to "0".
In addition, the monitoring status reception failure frequency C4 is read from the frequency information management table, and a value obtained by adding “1” to the monitoring status reception failure frequency C4 is set as a new monitoring status reception failure frequency C4. After updating and storing the information management table, the process proceeds to step S20.

In this step S20, step S19
The setting value N selected to be smaller than the preset setting value N1 in the normal state for which the number C4 of reception failures in the monitoring state calculated in
4 (<N1) is exceeded, C4 ≦ N4
If so, the process directly proceeds to step S6, and C
When 4> N4, the process proceeds to step S21, the state flag F is set to "1" indicating the skip state, the skip count C2 is set to "0", and these are updated and stored in the frequency information management table. And then step S
Go to 6.

Further, the transmission side hopping pattern management processing is executed when the transmission processing is started. As shown in FIG. 4, first, in step S31, the pointer of the frequency information management table designated by the pointer is designated. The status flag F of the hopping channel number being read is read, and then the process proceeds to step S32 to check whether the status flag F is "0" indicating a normal status, "1" indicating a skip status, or a monitoring status. It is determined whether it is "2".

When the result of the determination in step S32 is "0" indicating the normal state, the process proceeds to step S33 to output a command signal for operating the transmission circuit 4 and the frequency synthesizer 15 to the power supply control section 25 and ,
The hopping frequency fi of the corresponding hopping channel is output to the phased lock loop circuit 16 of the frequency synthesizer 15 to perform transmission processing of transmission data, and then the processing ends. If the determination result of step S32 is "1" indicating the skipped state, step S3
4, the transmission circuit 4 and the frequency synthesizer 15
Is output to the power supply control unit 25, the output of the hopping frequency to the phased lock loop circuit 16 of the frequency synthesizer 16 is stopped, and then the processing is ended.

Further, when the result of the determination in step S32 is "2" indicating the monitoring state, the process proceeds to step S35, and a command signal for activating the transmitting circuit 4 and the frequency synthesizer 15 is sent as in step S23. The frequency synthesizer 1 outputs the power to the power control unit 25.
The hopping frequency fi of the corresponding hopping channel is output to the phased lock loop circuit 16 of No. 5, the transmission processing of the transmission data is performed, and then the processing is ended.

In the processing of FIG. 3, the processing of step S2 corresponds to the selecting means, the processing of steps S3 to S9 corresponds to the communication state determining means, the processing of steps S10 to S13 corresponds to the reception skipping means, and the step of S14 ~ S21
Processing corresponds to the monitoring means, and in the processing of FIG. 4, the processing of step S34 corresponds to the transmission skipping means.
Next, the operation of the above embodiment will be described.

Now, from the other near field communication device having the same configuration as the near field communication device WC of FIG. 1, packets from 2.402 GHz to 2.48 are addressed to the near field communication device WC.
It is assumed that the data is transmitted with a predetermined hopping pattern in the frequency band of 0 GHz. At this time, if it is assumed that the short-range wireless communication device WC has received the previous hopping channel number at the hopping frequency well, and the state flag F is set to "0" indicating the normal state, the reception of FIG. When the side frequency hopping control process is executed, the process proceeds from step S2 to step S3, and the receiving circuit 3 and the frequency synthesizer 15 are activated by the power supply controller 25. When the transmission / reception antenna 1 receives a transmission packet from the short-distance wireless communication device at the transmission destination, the reception signal is received by the transmission / reception antenna 1 and the reception signal is received by the switching circuit 2. Is supplied to the receiving circuit 3 via.

In the receiving circuit 3, the received signal is supplied to the bandpass filter 5, only the band required by the filter 5 is extracted, and the extracted received signal is amplified by the low noise amplifier 6 and then by the mixer 7. The frequency synthesizer 15 mixes with the local oscillation output of the voltage controlled oscillator 19 to convert it into an intermediate frequency signal IF, which is supplied to a bandpass filter 8 to remove an image signal generated during mixing and then amplified by a limiter amplifier 9. And detection circuit 1
The analog demodulated signal that has been supplied to 0 and detected is input to the reception data processing unit 23 of the baseband signal processing device 12, and predetermined reception processing is performed. At this time, when there is no interfering radio wave at the relevant hopping frequency and the communication state is good, the received signal strength is high and the bit error rate BER of the received data processed by the received data processing unit 22 is BER.
Is also smaller than the set value, it is determined that the reception is good in step S4, the process proceeds to step S5, and the number of reception failures C
1 is set to "0", this is updated and stored in the frequency information management table, and then the pointer is incremented.

However, in an IS such as a microwave oven or a scalpel,
While the M-band jamming radio wave is generated, the level of the RSSI signal output from the limiter amplifier 9 remains higher than a predetermined level, but the received data processing unit 22
The bit error rate BER of the reception data subjected to the reception processing becomes larger than a predetermined value, the reception failure is determined in step S4, the process proceeds to step S7, the reception failure frequency C1 is read from the frequency information management table, and it is set to "1". The value obtained by adding "" is updated and stored in the frequency information management table as a new number of reception failures C1.

Then, the reception process is continued until the number C1 of reception failures reaches the abnormal threshold N1, but when the number C1 of reception failures exceeds the abnormal threshold N1, the process proceeds from step S8 to step S9. Status flag F
Is set to "1" indicating the skipped state, and the skip count C2 is set to "0", and these are updated and stored in the frequency information management table. Therefore, next, when the data receiving process of the same hopping channel number is performed, the state flag F is set to "1" indicating the skip state, so the process proceeds to step S10, and the receiving process is performed. Be stopped. When the stop state of the reception process is repeated and the number of skips C2 exceeds the set value N2, the process proceeds from step S12 to step S13, and the state flag F is set to "2" indicating the monitoring state. The number C3 of good receptions of the monitoring state and the number C4 of poor receptions of the monitoring state are both set to "0", and these are updated and stored in the frequency information management table.

Therefore, next, when the data reception processing of the same hopping channel number is performed, the status flag F is set to "2" indicating the monitoring status, so that the process proceeds to step S14, and the receiving circuit 3 and Frequency synthesizer 1
5 is controlled to the operating state, the receiving process is executed, and when the RSSI signal indicating the received signal strength at this time is equal to or more than a predetermined value and the bit error rate BER of the received data is less than or equal to the set value, the receiving state is good. Is determined, the process proceeds to step S16, and the monitoring status reception failure count C4 is "0".
Is set to, and the monitoring state reception good count C3 is read from the frequency information management table, and a value obtained by adding “1” to the monitoring state reception good count C3 is set as a new monitoring state reception good count C3. When it is updated and stored in the frequency information management table and the reception state is good, and the monitoring state reception good count C3 exceeds the set value N3, the process proceeds to step S18 and the state flag F indicates "normal state". In addition to being set to "0", the number of reception failures C1 is set to "0" and these are updated and stored in the frequency information management table.

Therefore, when the data receiving process of the same hopping channel number is performed next, the process proceeds from step S2 to step S3 to return to the normal receiving state.
However, when the state flag F is set to "2" indicating the monitoring state, the reception failure state is repeated and the number of times the monitoring state reception failure C4 exceeds the set value N4,
Since the state flag F is set to "1" indicating the skip state and the skip count C2 is set to "0" in step S20, the frequency flag is updated and stored in the frequency information management table. Next, when the data reception processing of the same hopping channel number is performed, the process proceeds from step S2 to step S10,
The reception process is stopped and the device enters a skip state.

Similarly, when performing transmission processing, the frequency information management table is referred to, and when the state flag F is set to "0" indicating a normal state or "2" indicating a monitoring state, a packet is transmitted. When the state flag F is set to "1" indicating the skip state, the packet transmission process is stopped. As described above, according to the above-described embodiment, when the reception failure state occurs at the hopping frequency of a certain hopping channel number and the reception failure number C1 exceeds the abnormal threshold value N1, the next corresponding hopping channel number is used. By skipping the reception processing when the reception processing is performed, unnecessary reception processing and transmission processing can be omitted at the hopping frequency where the jamming radio wave is generated, and the data transmission / reception efficiency can be improved. In addition to this, power saving can be achieved.

Moreover, after repeating the skipped state a predetermined number of times, the mode shifts to the monitoring state, the reception processing and the transmission processing are restarted, it is judged whether or not the reception state is good even in this monitoring state, and the reception state is good. When the communication state is repeated a predetermined number of times, it returns to the normal state, so when the communication state repeats a poor state and a good state, it stays in the monitoring state, and immediately after a poor reception state continues for a relatively short number of times, It is possible to shift to the skip state, and it is possible to reliably prevent the reception state from continuing in the poor reception state.

Further, since the communication state at each hopping frequency is managed by the frequency information management table, writing to the frequency information management table enables the short-range wireless communication device WC to be used in the environment. When the state of the jamming radio wave is known, the state flag F of the corresponding hopping channel number is written with, for example, "3" indicating a complete skip so that the state flag F is received when the state flag F is "3". By omitting the processing and / or the transmission processing, the detection of the communication state itself can be stopped.

Further, by storing the frequency information management table in the non-volatile memory, it becomes possible to retain the frequency information management table even when the power is off, and wireless communication with other short-range wireless communication devices is possible. By notifying each other of hopping frequencies that cause communication failure at the start, and skipping transmission and reception at the relevant hopping frequencies completely, it is possible to further improve communication efficiency and record secular changes to keep track of communication status. It is also possible to perform analysis.

In the above embodiment, the case where the state flag F is set to "0" and the defective state continues for a predetermined number of times and the state shifts to the skip state has been described. However, the present invention is not limited to this, and the process of step S5 may be omitted and the skip state may be entered when the cumulative value of the number of reception failures C1 exceeds the abnormal threshold value N1. The number C1 of reception failures may be cleared to “0” when the good reception state is continued a predetermined number of times.

Further, in the above embodiment, the case where the frequency information management table is referred to during data transmission to determine whether or not to skip data transmission has been described, but the present invention is not limited to this. Instead, when transmitting data, the packet may be transmitted regardless of the state of the state flag F. Further, in the above embodiment, the case where the communication state is detected by both the received signal strength and the bit error rate of the received data has been described, but the present invention is not limited to this, and the communication state of either one of them is May be detected.

Furthermore, in the above embodiment, the case where the data reception and / or the data transmission is skipped by the own short-range wireless communication device WC has been described, but the present invention is not limited to this, and the short-distance of the own device. The wireless communication device WC may notify the communication partner of the hopping frequency set to skip the reception process, and the transmission process and / or the reception process may be skipped a predetermined number of times on both the transmission side and the reception side. .

Furthermore, in the above-described embodiment, the case where the present invention is applied to the short-distance wireless communication device has been described. However, the present invention is not limited to this, and other wireless communication devices using the frequency hopping method can be used. Also, the present invention can be applied.

[0047]

As described above, according to the invention according to claim 1 or 7, when the communication failure occurs in the normal state, the receiving process of the corresponding hopping frequency is skipped a predetermined number of times, and this skipping is performed. When the status ends, the communication status is monitored while performing the reception process.When it is determined that communication is good in this monitoring status, the normal status is restored, and when communication is poor, Since it is set to return to the skip state, it is possible to reliably suppress the influence of jamming radio waves and improve communication efficiency without changing the hopping pattern, and since the reception processing is stopped in the skip state, The power consumption can be reduced, and further, the effect that a series of training operations as in the conventional example is not required is obtained.

Further, according to the invention of claim 2 or 8, since the transmitting process is skipped on the transmitting side as well, in addition to the effect of the invention of claim 1 or 7, the power consumption at the time of transmission is also increased. The effect that it can be reduced is obtained. Further, according to the invention of claim 3 or 9, since the communication status at each hopping frequency is managed by the frequency information management table, when the relationship between the hopping frequency and the communication status is known in advance, the frequency It is possible to register the information management table so as to omit the reception processing at the corresponding hopping frequency, and it is possible to obtain the effect that the communication state determination can be omitted. Further, by storing the frequency information management table in the non-volatile memory, at least the previous communication state can be retained, and high communication efficiency can be secured from the start of communication.

Further, according to the invention of claim 4, the communication state judging means and the monitoring means count the number of abnormalities of the reception state, and when the count value reaches the abnormal threshold value, the communication state is in the abnormal communication state. Since the abnormality threshold of the monitoring means is set to a value smaller than the abnormality threshold of the communication status determination means, it is possible to monitor with a small abnormality threshold in the monitoring status after shifting from the normal status to the skip status. Therefore, it is possible to immediately shift to the skip state when the communication is defective, and it is possible to improve the communication efficiency by shortening the reception process when the communication state is unstable.

Furthermore, according to the invention of claim 5, since the communication state is judged based on the received signal strength of the received data, there is an effect that it is possible to accurately judge whether the communication state is good or bad. To be Further, according to the invention of claim 6, since the communication state is determined based on the bit error rate of the received data, the effect that the influence of the jamming radio wave can be accurately determined is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment when the present invention is applied to a short-range wireless communication device.

FIG. 2 is an explanatory diagram showing a packet.

FIG. 3 is a flowchart showing an example of a reception processing procedure.

FIG. 4 is a flowchart showing an example of a transmission processing procedure.

FIG. 5 is an explanatory diagram showing a frequency information management table.

[Explanation of symbols]

WC Short-range wireless communication device 1 antenna 2 Transmit / receive switching circuit 3 Receiver circuit 4 transmitter circuit 12 Baseband processor 15 frequency synthesizer 21 Transmission data processing unit 22 Frequency hopping controller 23 Received data processing unit 25 Power control unit

Claims (9)

[Claims] 1. A frequency hopping wireless communication device, wherein communication data is communicated by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern, in a normal communication state while receiving the communication data. Communication state determining means for determining whether the communication data is in an abnormal communication state, reception skipping means for skipping the reception processing of the communication data at a hopping frequency corresponding to the abnormal communication state for a predetermined number of times, and reception of the communication data A monitoring unit that monitors the communication state while performing processing, and selects the reception skip unit when the determination result of the communication state determination unit and the monitoring result of the monitoring unit are in an abnormal communication state, and the reception skip unit determines a predetermined value. When the number of skips is completed, the monitoring means is selected and the monitoring result of the monitoring means is That it comprises a selection means for selecting the communication state determination means when a normal communication state frequency hopping wireless communication apparatus according to claim. 2. A frequency hopping wireless communication device, wherein communication data is communicated by a frequency hopping method for hopping a frequency based on a predetermined hopping pattern, in a normal communication state while receiving the communication data. Communication state determining means for determining whether the communication data is in an abnormal communication state, reception skipping means for skipping the reception processing of the communication data at a hopping frequency corresponding to the abnormal communication state for a predetermined number of times, and reception of the communication data A monitoring unit that monitors the communication state while performing processing, and selects the reception skip unit when the determination result of the communication state determination unit and the monitoring result of the monitoring unit are in an abnormal communication state, and the reception skip unit determines a predetermined value. When the number of skips is completed, the monitoring means is selected and the monitoring result of the monitoring means is It is characterized by further comprising: selecting means for selecting the communication state determining means when in a normal communication state, and transmission skipping means for skipping transmission processing of transmission data for the hopping frequency skipped by the reception skipping means. Frequency hopping wireless communication device. 3. The communication state determining means and the monitoring means are
3. The frequency hopping wireless communication device according to claim 1, wherein the frequency information management table is configured to manage the communication state at each hopping frequency. 4. The communication state determining means and the monitoring means,
It is configured to count the number of abnormalities in the reception state and determine that the communication state is abnormal when the count value reaches the abnormality threshold, and set the abnormality threshold of the monitoring means to a value smaller than the abnormality threshold of the communication state determination means. The frequency hopping wireless communication device according to claim 1, wherein the frequency hopping wireless communication device is provided. 5. The communication state determining means and the monitoring means are
5. The frequency hopping wireless communication device according to claim 1, wherein the frequency hopping wireless communication device is configured to determine a communication state based on an electric field strength of received data. 6. The communication state determining means and the monitoring means,
5. The communication state is configured to be determined based on the bit error rate of received data.
The frequency hopping wireless communication device according to any one of 1. 7. A frequency hopping wireless communication method, wherein communication data is communicated by a frequency hopping method in which frequency hopping is performed based on a predetermined hopping pattern, in a normal communication state while receiving the communication data. And a communication state determination step for determining whether the communication state is abnormal, and a skip for skipping a predetermined number of times of reception processing of communication data at a hopping frequency corresponding to the communication state determination step when the communication state determination step determines that the communication state is abnormal. Step, and monitoring the communication state while performing the reception processing of the communication data for the hopping frequency for which a predetermined number of skips have been completed in the skip step, and when the communication state is normal, the communication state determination step is performed, and abnormal communication is performed. If it is in the state, the monitoring switch that shifts to the skip step is performed. Frequency hopping radio communications method characterized in that and a-up. 8. A frequency hopping wireless communication method, wherein communication data is communicated by a frequency hopping method in which frequency hopping is performed based on a predetermined hopping pattern, in a normal communication state while receiving the communication data. And a communication state determination step for determining whether the communication state is abnormal, and a skip for skipping a predetermined number of times of reception processing of communication data at a hopping frequency corresponding to the communication state determination step when the communication state determination step determines that the communication state is abnormal. Step, and monitoring the communication state while performing the reception processing of the communication data for the hopping frequency for which a predetermined number of skips have been completed in the skip step, and when the communication state is normal, the communication state determination step is performed, and abnormal communication is performed. If it is in the state, the monitoring switch that shifts to the skip step is performed. Tsu and a flop, the frequency hopping radio communication method characterized by comprising a transmission skip step of skipping hopping frequencies in the skip state when transmitting communication data. 9. The communication status determining step and the monitoring step manage the communication status at each hopping frequency with a frequency information management table.
Or the frequency hopping wireless communication method described in 8 above.